All right
But I am referring to the limits of the level, not the altimeter tolerance or xpndr tolerance.
I feel lazy and I know it could take me hours to find the text where I read that an airplane is considered to be occupying a level anytime it is within 300 ft of it.
As a matter of fact when they instruct me to advise clear of a level, or to expedite through a level, I always wait until I have passed 300 ft after it to report clear or to resume normal rate.
Any one out there can confirm this 300 ft rule?